<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
</html>
<script>
    let a = Symbol('abc')
    console.log(a);
    let b1 = new Object();
    console.log(b1);
    let b2 = {}
    console.log(b2);
</script>